Portable electronic device displaying graphical user interface



FIG. 1 is a first image of a portable electronic device displaying graphical user interface showing our new design;

FIG. 2 is a second image of a portable electronic device displaying graphical user interface showing our new design; and,

FIG. 3 is a third image of a portable electronic device displaying graphical user interface showing our new design.

The broken line showing of the mobile terminal, and the numbers and symbols, is included for the purpose of illustrating environmental structure and portions of the article, respectively, and forms no part of the claimed design. 

CLAIM We claim the ornamental design for a portable electronic device displaying graphical user interface, as shown and described. 